Trastuzumab after Adjuvant Chemotherapy …Original Article. Trastuzumab after Adjuvant Chemotherapy in HER2-Positive Breast Cancer. Martine J. Piccart-Gebhart, M.D., Ph.D., Marion Procter, M.Sci., Brian ... http://www.nejm.org/doi/full/10.1056/NEJMoa052306